You have no idea how much I wanted this to be the legitimate mid-season upgrade. While Rabbit-Rabbit and Tank-Tank are cool; this one was just so much cooler to me. I was actually kind of looking forward to the idea of Sento pushing his limits and overcoming the berserker rage this form caused. Oh well.

This is a really cool upgrade. I never got to it in the show, but your comparisons to some of the other upgrades I'm familiar have me excited for it (I swear I'll find time maybe one day to watch it...). As a figure, I really like how they included a different head to give some more options. They're always nice to get in general, but here it has some extra importance from what you've said about its abilities that make at least the one a really nice thing to have.